"importantly" in the adverb sense
1. importantly, significantly
in an important way or to an important degree
"more importantly, Weber held that the manifold meaning attached to the event by the social scientist could alter his definition of the concrete event itself"
2. importantly
in an important way
"for centuries jellies have figured importantly among English desserts, particularly upon festive occasion"
Source: WordNet® (An amazing lexical database of English)
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